In “Apocalypse,” Glau plays Superman’s cousin Kara, who also survived the destruction of Krypton and also ends up on Earth. Glau joins animation regulars Tim Daly as Superman and Kevin Conroy as Batman.

Glau already has a live-action superhero project lined up with “The Cape,” NBC’s upcoming superhero series that can only be better than “Heroes” because it’s not “Heroes.” (In “The Cape,” Glau plays Orwell, a blogger who tracks down bad guys.) Glau’s previous TV roles include the genius programmer Bennett in Joss Whedon’s “Dollhouse” and the guardian cyborg Cameron in “Terminator: The Sarah Connor Chronicles.” She also played badass River Tam in Whedon’s “Firefly.”